Showerhead shell



FIG. 1 is a top, rear perspective view of a showerhead shell showing my new design;

FIG. 2 is a bottom, front perspective view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image of the front elevational view;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a showerhead shell, as shown and described. 